Though golden weeks over the past eight years havehuge returns for Chinas tourism industr

Though golden weeks over the past eight years have huge returns for China's tourism industry，voices cancellation of the nationwide holidays are becoming even stronger.
A. brought about；calling for
B. brought up；called on
C. brought in；calling in
D. brought on；called up

(答案→)A. brought about；calling forB. brought up；called onC. brought in；calling inD. brought on；called up解析：句意：尽管在过去八年里黄金周给中国旅游业带来了巨大回报，然而全国范围内要求取消假期的呼声却更强烈了。bring about“使发生，致使”；bring in“生产；挣得；介绍；引进”；bring up“教育，培养；提出，(军队等)调上来”；bring on“引起；使发展；提出”；call for“要求；需要”；call in“邀请；回收”；call up“唤起；提交，提出”；call on“号召；命令；要求”。由句意可知A项为正确答案。

我明天再问问老师，叫他解释下这个问题